Forming machine



. 6 Sheets-Sheet 1 l 1 7 REIJERIK BURHUP F. J. BORRUP FORMING MACHINE May 2, 1950v Filed Dec.. 17, 1947 F. J. BORRUP FORMING MACHINE IMay 2, 1950 6 Sheets-Sheet 2 y Filed Dec. 17, 1947 May 2, 1950 I F. J. BORRUP 12,506,264

FORMING MACHINE Filed Dec. 17, 1947 e sheets-sheet 5 INVENToR. j-T'REJJERIK BURRUP ATTORNEY Il IIII/ wl IiErFFFFFC. FFFFL l l l 1 L l I I F. J. BORRUP FORMING MACHINE May 2,1950

6 Sheets-Sheet 4 Filed D\ec. 17, 1947 P El JNVENTOR. FREDERIK BURRUP BY WTTORNEY May 2, 1950 F. J. BORRUFy 2,506,264

FORMING MACHINE Filed Dec. 1'7, 1947 6 Sheets-Sheet 5 F. J. BORRUP FORMING MACHINE .May 2, 1950 6 Sheets-Sheet 6 Filed Dec. 17, 1947 INVENTOR.

TTORNEY Patented May 2, 1950 UNITED STATES PATENT OFFICE 12 Claims.

This invention relates to new and useful improvements in forming machines and has particular relation to a machine for making metal patterns for use in precision casting.

An object of the invention is to provide a machine whereby metal patterns of great precision may be manufactured with a great savings of time and labor and thus of expense.

Another object is to provide a forming machine for precisely producing metal patterns .'such, for example, as metal patterns to be used in the producing of the blades of -a jet turbine.

A further object is to provide a machine adapt- :ed to produce on a smaller scale and with great accuracy a replica of ya llarge pattern, which large :pattern may be hand made of wood or fthelike, to the end that any errors in the pattern are reduced .in the smaller replica and the latter is thereby lmade of great accuracy and at comparatively low cost.

More specically, an object of the invention is to provide a forming machine adapted to reproduce on a small scale a relatively large 'hand :made pattern :involving many slight generated icurves.

Other objects and advantages of the invention will become apparent from a consideration :of the following detailed description taken in =connection with Ythe accompanying drawings -wherein satisfactory embodiments of the invenition are shown. However, itis to be understood that the invention is Vnot limited to the details :disclosed but includes all such variations and zmodifications as fall within the spirit ofthe in- :vention andthe scope of the appended claims.

.In the drawings:

fFig. 1 is a front elevational view of a forming machine made in accordance with the invention, fthe machine being adapted for support on a work .ibench or the like;

Fig. 2iis a-plan view of said machine;

Fig. 3 is a lhorizontal sectional view taken as :along the line 3--3 of Fig. `1;

fFig. 4 is an enlarged front elevational view fo'f a carriage and its supporting or mounting :structure and associated parts;

Fig. 5 is an edge elevational view taken as and its supporting and associated parts but with certain modifications;

Fig. 10 is an elevational view looking from the left in Fig. 9;

Fig. 11 is a view similar to Fig. 1 but showing a modification; and

Fig. 12 is an enlarged sectional view taken as along the line I2-I2 of Fig. 11.

Referring in detail to the drawings and at first more particularly to Figs. 1-8, my improved forming machine is shown as including a hollow base I0 which may be a casting or several castings, as convenience indicates, and which is provided with end anges II and side flanges I2, all provided with perforations I3. Clearly, the base Ill is adapted -to be disposed on a bench or `table or similar support and may :be fastened-in place by passing screws or -bolts through the perforations I3. All of -the mechanism of .the present forming machine is mounted on ythe base IIJ and thus Ait will Abe seen that the entire machine may be shifted as a unit vfrom any one Ybenchor `place to another and it will also be clear that the machine may be conveniently mounted 7 on any bench or table-like support whether the `latter `is portable or not.

The mechanism mounted on the base I0 includes a work support generally designated I4, a pattern support generally designated I5, a mounting structure generally designated I6, a carriage generally designated I'I and slidable or reciprocable in said mounting I6, a tracer mounting means generally designated I8 and shown in the form of a pantograph and mounted on said structure I6, and a tool or cutter mounting means generally designated I9 and also disclosed as a pantograph means mounted on said structure I6. A work piece is designated 2D and the same as here disclosed comprises a cast metal piece and in the drawings is shown by broken lines. This piece may be cast to the general vshape ofthe iinished product but contains ample material for removal whereby the nished product will be of the exact dimensions and contours desired.

Work piece 20 is provided at its upper and lower ends with studs or extensions 2l and such lower extension is shown as gripped in a chuck device 22 while the upper end or extension is received in a vertically adjustable tubular bearing element 23. Chuck 22 is shown as having its shank 24 gripped in a head or collar 25 as by means of a set screw 26 and said head or collar 25 is integral with or is otherwise made turnable with a vertical shaft 21 having a bearing 28 in a casting 29 and also having a bearing 30 in the upper wall portion 3i of one end portion ci the base casting The shaft 2'! enters such hollow base casting and therein has aixed to it a bevelled gear the purpose of which will appear. The hollow step-like casting 29 is shown as secured to one end portion of thebase casting Il) and as actually bolted-to the wall 3i of such portion. The bolts for this purpose are designated 33. On the upper side of the step-like casting 2S, a cast or otherwise formed bracket arm 34 has its lower "p`or tion secured to the casting 29 as by bolts-tifAt its upper end, the casting 34 includes ly directed arm 35 provided with `an enlarged.` cr hub-like bearing portionpor ring 3l `inwlriich-the element 23 is turnable and through which'said element is vertically adjustable. It will beunderstood that the element 23 is adjusted vertically :up and down whereby v -longenV worle pieces: 20

may be accommodated between such the chuck means-22f v f The studs 2! on the end of va vvcrlrjpiecebeing element and received Lin the' chuchandin theinnerend oi the element 23, the latter isi-fixed in this verticallyi adjusted position by-tightening of a set screw 38. While the drive means'will later be i set forth', here it is inoted thatpn thegear 32 beingdriven, shaft 2l; is driven and through the g chuck means 22 causes .rotatio n of theworkpiece v 2t. Atythis time-,the stud-2t at the upper end of` the'-workpiece-turnsin .the element 23;v the latter being 1 held against turning movement by the set'screw 38;v f

The pattern support itis r-illustrat-ed as incrimiz-y '-E ing or supporting a pattern oncontrol element generally designated efandshownby broken lines. `Tln's'pa-ttern is provided with stud-like extensions 5%- at its uppen-andflower ends and it will'be understood-:thatAtheipattern ismade on a predetermined scal ewithjrespectVtothe size of the finished ywe rlf;piece..- "I'l 1us the pattern maybe vtriade-riale times, theactual size-orthe desired product; and g preierably is inadeof wood and made as closelyasv-possible-to the actual contoursfwhich are-:desired inthe Yiinishedwork 4i: 'l`It` f will be-appreciated thatthe pattern 39 being l 0' ofdeite'ratio to 'ther-work piece 2G, when a longer or shorter work piece is mounted by the .5f work support lf3 entailing adjustment of the bearing'telement 23, then a longer or shorter pattern v39"v'vll be mounted in the pattern support i5 eentailngl adjustment of the bearing element 53.

...Furthelg as the description proceeds, it will be- ""corn'e'v more- 'apparent that the pattern must be ;:.;mount,ed with its mid portion in a definite re- That is, :if the lwork .piecev isthreeinche l for example, theV pattern '.rna-yy be fl-ft 'oi the pattern; vthat'is sevfenandjonehal Vfrom 'either end,- must be in horizntal one fand onefhalf inches. fr

lationship to the mid portion of the work piece.

` alignment :withthemiCl portion' or" thef .ivorkv e,` that is Yitlier end'ptjthe work piece. L Undertheselc ifthe lnewI patternsishbrter or,

in cunting of thekpatterr will not 'sujiiice.

Thus, .other :endanger coilarsjfl y may hitherto; thinner clucl; EH; andthe flangegli.,v all' require. Y 'In .thi'slpartieular conn that'theshanries ofenuk fn i vlength VAso .as to provide for the aboutfs'aid jsuitably mounted as iin-fn "bearings- 55 in tiiebas'e' iE! is a horizoptally dis posed longitudinally extending:y shait'5,. This "considerable mounting of shims vshaft 'carries betreuen nears. .5 and? te meshing,

respectively, with.;thef, beyelled Y'gearsjJliZ --neretoforeA nientioned. A With this` construction, it will be clear"that on'rtatiori of theshaft 56,

piece. YIn-'the event-that-alscale of vev.to one is used, twillbe -understoodthatthestuds it need not be to scalebut lshould-'be properly locatedfor the proper mounting` of thepattern.

The lower studA il`ilv-sshown` as secinedin a collar or" chuck-ttby lmeans offa set-serew 42 Vand suchrcol-lar is provided with a shank ori extension it vclamped'in"arcollar or enlarged diameter angeportionliasiby a-'set screw: L15.

and in concentric relation with'a shaft t having bearing in the upper wallportion Sietoward-cne end of the casting` iilfn this.connection-it.is

Vnoted that fian'ge 'portion' 45' is :integral with the shaft it :and supports the latter against casual downward movement. 1 lIliiredyitoI the-@shaft it responding with the bevelled gear 3g previoush,

mentioned; f Y v i Also exacto the upper '51de or these ewan f.

` carriesa bearing-'52 locatedabove' andicencentric with the shaft iidfsttidV 4t; 'etc. A'ihroughthe bearing 52 'passes aiyertically addstable` bearing element aiwthefilowerend :of: which-receives the upper stud d!) of the pattern 39. With the de )fthe worl:piece, 2.andthe patternflgwill" be rotated labout Atheir vertical longitudinali', axes.

rthe -workpiecefand theepattern,'according to @the invention, are .rotated insyn'chronisrn and. thus identical and-that the, gearsj'i and `'5t are lidentikcal. Under: such circumstances thefworl 4piece 1 and pattern willbe:rotatedinfsynchronisrn?,

hand

when setting up the machine or thelike vVhen .the machineisfin'operation, AYit iste loe-@driven ;by. anr electric motor 15S through 4.suitable reducv-wthin` suchfcasting'iis-a bevelledfgear eefcor- .'more freely. turnable'by-,the hand wheel ipieceand pattern-will lne-,caused to rota eiabout their verticalglongitudinal fagiesg desired," any clutch or other known rneanssrnaybe u sedzwherebythe drive-betweenfthe meter @and ,the Shaft 56 may be interrupted'sdjthetlthe S'haftfwflll be 59 when such an action is desirable-=j Itfis .clear that inenten; slppojt ii-eend the pattern support i5 are located.to\ vard vopposite 3) the axes of the work piece ,andgpatternvlare in `the.J same; .vertical,...planefrire` ten-like. 'Casting rails 19.

' ed as at 9I. an enlarged diameter portion 92 resting on the A'mid point of the casting I0 is vprovided with a relatively heavy bearing 65 depending from its upper wall 66. This bearing receives and mounts 'a vertically disposed relatively heavy or large f like portion (see Figs. 4 and 5) of the mounting structure I6. In addition to said block-like portion 10, the mentioned structure includes front and rear vertically disposed plates 1| and 12 clamped to and against the block "I8 as by bolts 13 and at their upper ends spaced by and clamped against a block 14 as by means of screws or bolts 15.

It will be noted that the portions 10, 1I, 12 and 14 constituting the mounting structure I6 are each of a heavy rigid construction whereby the entire mounting structure is rigid and the same is in the form of a hollow oblong open at its sides. Secured by bolts 16 to the inner surface of the front plate 1I (see Fig. 7) of the mounting structure are a pair of spaced parallel guide bars or rails 11 and fastened by bolts 18 to the inner surface of the rear plate 12 of the mounting structure are a pair of spaced parallel guide bars or The rails 11 are arranged exactly opposite the rails 19 and in opposing relation therewith.

The carriage I1 is a block-like structure somewhat in the shape of a Greek cross including a body structure 80 having portions 8| and 82 of reduced thickness and slidably tting between the pair of guide rails 11 and the pair of guide rails 19, respectively. In addition, pairs of ears 83 and 84 project from the lower portions of the opposite edges of the body 80 for a purpose to be described. These ears project toward the open sides or edges of the above described hollow oblong mounting structure I6.

The lower block 10 of such structure rests on the collar 68 and is secured to the stud-like extension 69 by dowels 13a. Said extension is integral with larger diameter stud shaft 61 mounted in the bearing 65. From this, it will be seen that the entire structure I6 may turn or oscillate about its longitudinal axes, the center of any such turning or oscillation being the center of the stud shaft 61.

To the rear of the mounting structure I6 a bracket 85 is secured to the casting wall 66 as by screws or bolts 86 and such bracket includes an upper forwardly extending arm portion 81 having a bearing ring 88 at its forward end. Passing through and turnable in said ring is a shaft 89 to the upper end of which is fastened a hand wheel 90 and the lower portion of which is thread- This shaft 89 may be integral with upper side of the block 14 and filling the space between such block and the lower side of the bearing ring 88.

A ller means 93 may be integral with the upper side of said bearing means and lls the space'l between the latter and the hand wheel and, in fact, may. constitute a hub-like portion of said hand wheel. The shaft 89 passes through the upper end block 14 of the hollow oblong constituting the mounting structure I6 and within said structure is threaded into and through the carriage I1. Clearly, with this arrangement, the screw threads 9| prevent-gravitational downward i movementv of the carriage I1 but on turning of the hand wheel 90 said carriage may be fed or I slid upwardly or downwardly, depending n the direction in which the hand wheel is turned.

On turning of the hand wheel, the carriage will slide since the shaft 89 will turn with the hand wheel and is threaded to the carriage and such shaft is held against longitudinal movement while the carriage is held by the guide rails 11 and 19 against turning movement but is clearlyy adapted for guiding reciprocations between said guide rails.

Below the guide rails 11 and 19 and extending between and mounted by the front and rear walls 1I and 'I2 of the described hollow oblong structure I6 are upper and lower pins or shafts 94 and 95. Thevpins or shafts 94 and 95 are parallel with one another and are in vertical alignment and are so located that their axial center lines are at right angles to the axial center line of thel shaft or lead screw 89.

shafts pivotally mount the inner ends of a -pair of; arms 96 and 91 constituting portions of a panto graph structure embodied in the tracer mount-` ing I8 and they also form pivotal mountings forthe inner ends of a pair of parallel arms 98 and!- 99 constituting portions of a pantograph struc-- ture forming a part of the cutter or tool mounting; means generally designated |9.

To the desired end (see especially Fig. 8) thef inner end portions of the arms 96 and 91 are en larged providing head-like portions |08 located between the front and rear plates 1I and 12 of the mounting structure I6 and of a width sub- ,-stantially equal to the distance between the inner surfaces of said plates.

Each head-like portion is mounted on one of the pivot means 94 and 95 and is bifurcated as at |0I. The links or arms 98 and 99 have their inner end portions received in the bifurcations IOI of the respective arms 96 and 91 and are pivotally mounted on the respective means 94 and 95. In this way, the arms 96 and 98 are mounted on one pivot means 94 while the arms 91 and 99 are mounted on the other pivot means 95.

A link |02 is pivoted at its upper end and as at |03 to the ears 84 on the carriage |1 and at its lower end is pivoted as at |04 to the above described arm 96. Somewhat similarly, a link |05; is pivoted at its upper end at |06 to the ears 83 on the carriage and this link at its lower end is pivoted as at |01 to the arrn 98 of the tool or cutter mounting means I9.

At their outer ends, the arms 96 and 91 are pivoted as at |08 and |09 to a web-like Iportion |I0 of -a piece or casting generally designated II I. The web ||0 constitutes a rigid connection between the pivots |08 and |09 and thus between the outer ends of the arms 96 and 91 being rigid are always in exactly parallel relation.

From the web ||0 the device or means II I includes a forwardly directed arm |I2 h-avinga bifurcated head-like portion I|3 at its free end land in which is mounted a tracer II4. This of the member I I I.

The arms 98 and 99 at their outer ends are pivotally connected as at |I6 and I I1 to spaced portions of a rigid bracket structure |18. The dis- These pins or short.

as the means ljand lll incline at one vside or the other of horizontal center.

As the pattern and work are being turned during this movement of the tracer and tool, the latter instrumentalities will engage the pattern and work over spiral lines; Since the structure I6 may pivot about -the axis of the stud 61, it will be seen that both the stylus mounting means and the tool mounting means may swing horizontally as wider or narrower portions of the pattern press against the tracer. However, corresponding portions of the work piece will face the cutter |20 and so the latter remains in contact with the work piece at all times. The position and the connections of the counter weight with the stylus mounting means i8 insures that the stylus will remain against the pattern and the tool will remain against the Work. It will be understood that during these operations the electric motor |24 is energized and through the flexible shaft |23 and coupling |22 is driving the tool or cutter |20. v The form which the tool or cutter l2!! takes is not here controlling since the tool or cutter may be in the nature of a small milling cutterl or of a small grinding wheel such as a diamond grinding wheel, or the like. In any event, through the hand wheel 90, the carriage l1 is reciprocated up and down in a path parallel with the axes of the patternsupport and the work support and atreach reciprocation the tool is passed over the slowly revolving work piece. With the described construction it will be apparent that due to the ratio of the various parts, any slight errors in the pattern 39 will be reproduced only to a small degree in the work piece. Thus, if the ratios employed are five to one and the pattern is'carefully made, any small error in the pattern will be reduced by four-fifths when it appears in the work piece. Thus, an error of .001 in the pattern will represent an error of but .0002 in the work piece.

From the above, it will be understood that with the present machine skill is required on the part of the mechanic making the pattern 3'9 but once the machine is set up with that pattern, the olf)-l eration is nearly mechanical. The only thing re' quired on the part of the operator isthat he turn the hand wheel 90 in one direction to feed the tracer and cutter downwardly over the pattern and work and then reverse the direction of turning of the hand wheel to feed the tracer and cutter upwardly over the pattern and work. It is planned that during each stroke the lcutter will remove but a slight amount of material. many strokes of the cutter, each removing a slight amount of material from the work piece but all material being removed. to establish the proper contours, a finished and highly accurate pattern is rather quickly (as compared to former methods) and-inexpensively made. Referring no w to the modification of Figs. 9 and 10. In this structure the modicatiorl con'- sists essentially in that the shaft or feed screw' 83 is power driven by a reversible motor. With the exception of the motor and the controls for the same, the parts heretofore described are again employed and for the sake of clarity and brevity have been identified by the reference characters heretofore applied to them.

. Thus, in the modification I have the mounting structure |t and the slide I1 slidable or reciprocable therein as well as the bracket 85. In the modification, the hand wheel 30 heretofore used is omitted and in its place a reversible electric After g Iii) ill

motor |33 is mounted by the bearing ring or means 38 of the bracket 85. This motor is connected to drive the shaft or lead screw 89 having the lower threaded portion 3| threaded into the carriage |1. Carriage I1 is provided with -a finger-like extension |34 located above the ears 83 and which finger-like portion is rigid with the carriage and mounts a vertical rod or bar |35 threaded throughout substantially its entire length. Y

Mounted on such threaded rod or bar is an upper nut |35 and a lower nut |31 adapted for threaded adjustment along the rod or bar toward and from one another. Fixed to the rear plate 12 of the hollow oblong mounting structure I6 is an L-shaped plate |38 including a portion |39 fastened to plate i2 as by bolts |43 and a relatively long vertical arm |4| extending parallel with the shaft 39. Mounted on the mid portion l of the arm |4| is a reversing switch |42 the operating piece or handle 43 of which projects to be engaged by the nuts |36 and |31.

On the upper portion of the arm |45 is mounted a micro-switch |44 held in place as by screws |45 and adapted for vertical adjustment within the limits of a slot |46. Similarly, a micro-switch |41 is mounted on the lower portion of arm |4l, in line with the switch Mii, and is held inpla-ce as by bolts |43 passing through a vertical slot idg corresponding with the slot |46.

Push buttons or the vlike |59 of the microswitch l'44, and |5| of the micro-switch |41, pro-I ject forwardly into positions to be engaged by the nuts |36 and |31. In the construction illustrated in Figs. 9 and l0,v the micro-switches |44 and |41 have no part but such switches are shown in these figures since the iigures include the means for mounting them and these switches are actu-ally used in connection with the modification shown in Fig. 11. A

With the describedl construction of the modification of Figs. 9 and 10, after the pattern and work have been mounted in their supports the carriage l1 is reciprocated `or slid up and down along the paths defined by the guide rails 11 and 19 by the electric motor |33. To this endythe nuts |36 and |31 are adjusted to the proper posi,- tions on the threaded rod |35. It will be clear that this rod moves with the slide l1. As the slide moves downwardly, the nut |315 is brought into position to trip the lever |43 whereby to have the motor 33 reverse. This will take place at the lower end of the stroke of the tracer lili and cutter |20.

When the nut |36 trips the switch |42 and motor |33 reverses, the screw 83 is turned in the opposite direction and feeds the carriage l1 upwardly causing the tracer i4 and the cutter tool 2Q to move upwardly over the pattern and work, respectively. At the upper end of the stroke, the nut 31 again trips the switch control |43 whereby the direction of rotation of the motor 33 is again reversed and the drive4 of the shaft Si? is reversed to again feed the slide downwardly.` Thus, it will be understood that thenuts |36 and |31 being properly adjusted, they alternately engage the switch'lever |43 reversing the motor |33 at each of the upper and lower limits of movement of the stylus and cutter verthe pattern and work. At the limit of downward movement of the carriage, the nut |31 eng-ages the button i5! of the micro-switch |41 (see Fig. 10) and at the limit of the upward movement of the carriage, the nut |36 engages the button illu of the upper micro- -switch |44.. `Since these micro-switches are verandere@ tically adjustable .owing to..the.pro.vision ofthe` slots |46and |49,:it willbemnderstocd:thatthe positions of .the micro-switches mustbe and. are changed ineccordance .withany adjustmentso the :nuts |35v and |31 on thethreaded bar er rod |35. The full purpose ofthe switches 4|land|41 will beset forth when consideringFigs.I 11 andfl.

-From the above, it .willbeunderstood that the structure proposedin Figs..9sand..10is substantially the same as that of Figs. 1-8 with theexception that thecarriagew |1 isto be .power-driven infeach direction `by. the. reversible .electric motor |33. .This eliminates theoccasion for thehand wheel .313. and the labor and. attention involved in the manual .manipulationI of said wheel.

Referring nov/'to the modicationof Figs. 1l andv 12, `the machine there shown is in a large measure the. machine previously `described and wherethe parts are the same they areidentiiied by thesame referencecharacters.` In the structure of this modication, the reversible :electric motor |33 and its controlare again .employed and furthermin this Arnodication' the micro-switches |44 and. idlexercisetheir functions.

Thev new parts .involved in the modification comprise aratchet wheel |52 fastto an. inter-` mediate portion of-Jthe shaft .56 and associated with said ratchet -.wheel and movable about said shaftis. a lever |53 carrying a `pawl..| 54, normally heldin engagement with-.the ratchet wheel as by a small coil springV |55.. Eixedto the lever |53'is the outer vend. of a plunger |56- of a solenoid magnet. |51 locatedwithin-and .fastened to the casting. |v .as bythe screws |58. vlhe solenoid coreand .thelever |53 .on being moved from their ynormal `.position..(shown in Eig. .12) and thereafter. released, arereturned to saidvr normal position as bya coilspring |59anchored at .one end to the .lever andatitsiother end to a vwall ot the casting I0. Also carried by thecasting and suitably located .is .a stop. .or .limiting device: r |60 determining the extent of the return movement of theA lever |53 under the. influencent' the-spring |59.

The structure. of. the modification of Figs. 11 and 1-2 operatesmuch inthe manner of the strucf ture rst described.. However, inthe structure first described-the workpiece .2Q and the Apattern 39 are constantly rotated inthe same direction. Where the pattern and work .pieceftrail oi `to a rather thin edgedifficulty may be encountered with the rst described structure as such vthin edges work against the tracer and the cutting tool. That is, these thin trailing edges may -flex under the described conditions whereby thefresultant product would not be trueor accurate. n

With .the devicefof the vmodiiicationIof Figs. l1 and 12, the pattern and the work-piece are rotated in an` intermittent manner or in a step-by'- step manner. .This step-by-step rotation takes place. at the end of eachstroke of .theftracer and cutter `whether 'such stroke be vupr or down. Therefore, instead of #the tracer-and `toolengag-f ing the pattern andworkfover-a epiraLpath. they Vengage the pattern and workiover "stra-ight. Vertr cal paths and ther-.eiis less,'.if any, tendency to cause .any flexing of thinner :or :narrower edge portions of .the pattern and/.or work.

When thermachine of.Figs..-11-and 12 is placed in operation, themotor |33 and .thefswitch A|42 `function as heretofore described. However, at the vend of a stroke ofthe .carriage -(and thus of 4the tracer-and tool) Vfor example, 'a downward stroke, the -nut `|31 will engage the button |5| of .the :micrswitch `;|.|1 and Yclose a `lcircuit l.to

12 the ,solenoid magnet. |51. .As thissmagnetisenei-, gized, it draws inwardly on-thecore |56. operating the1ever.|53 about .the shaft. 5B..as.a center. This will be a .clockwise movement of `the lever asl viewed inFg. .12..

.Asthe lever moves it.will, operating .throughits pawl. |54, turn the y.ratchet |52 .one step. vThis will .turnthe shaft. 56 a predetermined amount and Vthrough theabove describedgearing connec-y tions, such .turning movement of the. shaft will) be imparted tothe pattern. and Ywork and the, latter will each be rotated oroscillatedthroug'ha .pre-n determined step .orc-arc. .-At. this time, the nut |36. has engaged and operatedthe .handle |43 .o the reversingswitch |42 and the` motor |33 then operates to feed or slide .the carriage |1 upwardly. This carries the nut |31 from `the-button l5| of micro-switch |41 and theswitch opens and the. solenoid |51 is de-energized..

.Now the .spring .|59 operates to return `the ratchet and solenoid structure to normalposition ready for the next operation. At the :upper end',

of the movement of thecarriage (and thus of the tracer andgtool) .thenut |31 trips thereversing switch |42l toreverse the motor |33. .Atthesame time, the nut |35` engages ythe button. |50 ofthe micro switch |44 again energizing the solenoid magnet |51 to again operatethe pawland ratchet means and advance thesha'ft, a step and to advancethe pattern. and work a step in the same direction.

Thus, with the structureof the modification, it will beA clear4 that :movementof :thepattern and work. is not continuous asfwith the structure rst describedY but is intermittent or vvstep.by.step. That is, ,the pattern and the work .areadvanced synchronously astep at theend of .eachstroke of the slide andthe tracer and tool controlled vby the;slide. In this way,afseries .of fine, veryflgee togethenstraight` parallel'cuts are made on the work Land, there .will be. -nogiiexingu of the pattern and Work to result in inaccuracies such as might resultiwhen. a` thin. or trailing edge portion of vthe patternwasomed :to act against andshiit the tracer and thusfthe structureA |-5 and all Aparts mountedgthereby or associated therewith in the machine-wherein the patternandwork are continuously rotated `about theirv vertical axes.

Fromithe foregoing it is believed that the scope and spirit. of lthe-.invention will be apparent.. However, itzis desired to .point vout that; the tracer and tool maybe mounted on :opposite ends 'of ia single rigidtbeam pivoted-.oi-.center in the desired ratio. Further,to.obtain the .desired necessary relative movement between the :tool and work piece and ythe'ltracer and pattern, the supports for the vwork vpiece and `-for the pattern may be moved vertically or may tbe-moved longitudinallyr and, yin such instance, the Acarriage may be omitted or need-not be moved. Further, in certain timed relation, it isI deemed possible that the patterns and work pieces Vbe rotated 'inopposite directions instead Vo'f in Zthe-"same direction but neverthelessV it is 'feltthat the movement 'of these pieces would'be synchronous.

'Having thus set'fforth-the'nature of myinvention, what'I f claim 'is 1,'111 a forming/machine, abase, a pattern support on said base, fa work support on said base and spaced horizontally VAfrom said patternsupport, said 'supports mountedv for turning `movement on vertical axes, Va 'carriage vsupport located between said pattern and work supports, means Ymounting ysaid carriage support on said baseufor tturning movement `on a vertical axis auoegaci 13 substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidably mounted on said carriage support, means for sliding said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends to said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding movement of the carriage on the carriage support, vand means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively.

2. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement on vertical axes, a carriage support located between said pattern and work supports, means mounting said carriage support on said base for turning movement on a vertical axis substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidably mounted on said carriage support, means for sliding said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends to said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriagesupport the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding movement of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the oppositesides of a pattern and a piece of work on said pattern and work supports respectively, and means for rotating said pattern support and work support in unison as said carriage is slid upwardly and downwardly on the carriage. support and said arms are swung on said horizontal axis.

3. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports `mounted for turning movement on vertical axes, a carriage support located ioV between said pattern and work supports, means mounting said carriage support on said base for turning movement on a vertical axis substantially horizontally aligned with the axes on which said pattern and Ywork supports are turnable, a carriage slidably mounted on said carriage support, means for slidingly reciprocating said carriage .upwardly and downwardly' on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to saidl carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a.'

pair of links pivoted at their inner ends to saidi` carriage and at their outer ends to the respectivef arms at points spaced from the means anchor-- ing the inner ends of the arms to said carriagel support whereby on sliding movement of said. carriage on the carriage support the arms are swung about the mentioned horizontal axis, said' links connected with the respective arms at,

movements to said pattern support and workv support in timed relation with reciprocations of said carriage on said carriage support and 'upward and downward swinging of said arms on said horizontal axis.

4. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement on vertical axes, a carriage support located between said pattern and work supports, means mounting said carriage support on said base for turning movement on a vertical axis substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidingly mounted on said carriage support, means for slidingly reciprocating said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mountingV a tracer and a tool respectively, means anchoring the inner ends of said arms to said car- 1 riage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends to said carriage and at their outerends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis,

said'links connected with the respective arms at points equidistant from the mentioned horizontal' axis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding movement of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the op-v posite sides of a pattern and a piece of work on said pattern and work supports respectively, a.

tially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidingly mounted on said carriage support, means for sliding said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends toV said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding move ment of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively, and said arms each comprising a pantograph-like structure whereby said tracer and tool are always. at the saineV angle with respect to a pattern on said pattern support and a work piece on said work support in all of the various positions to which said arms may be swung about the mentioned horizontal axis on both upward and downward sliding movements of the carriage on said carriage support.

9. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement on vertical axes, a carriageA support located between said pattern and work supports, means mounting said carriage support on said base for turning movement on a vertical axis substantially horizontally aligned with the. axes on which said pattern and work supports are turnable, a carriage, slidingly mounted. onK said carriage. support, means. for slidinglyI reciprocating said .carriage upwardly and downwardly on said. carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends to said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about which said arms are swingable whereby equal angular movement is imparted to the arms on a sliding movement of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a, tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively, a feed screw mounted for turning movement about its own longitudinal axis on saidv carriage support, said feed screw in threaded engagement with said carriage whereby on turning of the feed screw said carriage is slidingly moved in the direction of the length of said feed screw and relative to said carriage support, an electric motor on said carriage support and connected to drive said feed screw, said electric motor a reversible motor, reversi-ng switches on said carriage support, means movable with said carriage and engageable with said switches at predetermined times to reverse said motor and thereby the direction of rotation of said feed screw and the direction of sliding movement of said carriage, and means for simultaneously imparting a step-bystep turning movement to said work support and to said pattern support on each reversal of said electric motor.

l0. En a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement cnvertical axes, a carriage support located between said pattern and work supports, means mounting said carriage support on said base for turning movement onl a vertical axis substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidingly mounted on said carriage support,rrneans for slidingly reciprocating said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting ak tracer and a tool' respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizon-tal axis, a pair of links pivoted at their inner ends to said carriage and at their outer ends to the respective arms at poi-nts spaced from the means anchoring the inner ends ofthe arms to said carriage support whereby on sliding movement of said carriage on the carriagek support the arms are swung aboutl the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about whichsaid arms are swingable whereby equal angular movementv is imparted to the arms on sliding movement of the carriage on the carriage support, mea-nsconstantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively, said means for slidingly reciprocating said carriage upwardly and downwardly comprising a feed screw mounted for turning movement about its own longitudinal axis on said carriage support, said feed screw having threaded engagement with said carriage and extending above the upper end of said feed screw for manually turning the latter in a selected direction whereby to feed said carriage in a selected direction on said carriage support.

11. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement on vertical axes, a carriage support located between said pattern and work supports, means mounting said carriage support on said base for turning movement on a vertical axis substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidingly mounted on said carriage support, means for sliding said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of linlrs pivoted at their inner ends to said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontalaxis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding movement of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively, an electric motor mounted on the arm the outer end of which mounts said tool, said arm mounting said tool for rotation relative to the arm, and a driving connection between said electric motor and said tool for rotating the latter from the former.

12. In a forming machine, a base, a pattern support on said base, a work support on said base and spaced horizontally from said pattern support, said supports mounted for turning movement on vertical axes, a carriage support located between said pattern and work supports, means mounting said carriage support on said base for turning movement on a Vertical axis substantially horizontally aligned with the axes on which said pattern and work supports are turnable, a carriage slidingly mounted on said carriage support, means for slidingly reciprocating said carriage upwardly and downwardly on said carriage support, a pair of arms at their outer ends mounting a tracer and a tool respectively, means anchoring the inner ends of said arms to said carriage support for turning movement therewith about a vertical axis and for swinging movement relative thereto about a horizontal axis, a pair of links pivoted at their inner ends to said carriage and at their outer ends to the respective arms at points spaced from the means anchoring the inner ends of the arms to said carriage support whereby on sliding movement of said carriage on the carriage support the arms are swung about the mentioned horizontal axis, said links connected with the respective arms at points equidistant from the mentioned horizontal axis about which said arms are swingable whereby equal angular movement is imparted to the arms on sliding movement of the carriage on the carriage support, means constantly tending to turn said carriage support on its vertical axis whereby to maintain a tracer on one of said arms and a tool on the other thereof against the opposite sides of a pattern and a piece of work on said pattern and work supports respectively, a feed screw mounted for turning movement about its own longitudinal axis on said carriage support, said feed screw in threaded engagement with said carriage whereby on turning of the feed screw said carriage is slidingly moved in the direction of the length of said feed screw and relative to said carriage support, an electric motor on said carriage support and connected to drive said feed screw, an electric motor mounted on the arm the outer end of which mounts said tool, said arm mounting said tool for rotation relative to the arm, and a driving connection between said electric motor and said tool for rotating the latter from the former.

FREDERIK J. BORRUP.

REFERENCES CITED rEhe following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 679,120 Feron July 23, 1901 881,021 McLane Mar. 3, 1903 888,041 Salo May 19, 1908 2,370,032 Groen Feb. 20, 1945 FOREIGN PATENTS Number Country Date 20,784 Great Britain 1397 337,076 Great Britain Oct. 30, 1930 

